Colloidal Quantum Dots‐Based Bioinspired Reconfigurable Photoelectrochemical Device for Broadband Underwater Imaging and Photosynaptic Memory

Underwater artificial visual systems that couple visual perception with memory capabilities are of great significance for intelligent marine environmental monitoring, autonomous underwater robotics, and deep‐sea resource exploration, thereby requiring intelligent optoelectronic devices with broadband spectral adaptability and multifunctional photodetection (PD)/photosynaptic (PS) functionalities. Here, inspired by the spectral adaptation and homing memory of Pacific salmon, we report a reconfigurable photoelectrochemical (PEC) device based on near‐infrared (NIR) CuInSeS/ZnSe (CISeS/ZnSe) quantum dots (QDs), in which the Ag incorporation enables spectral adaptation through redshifted absorption while weakening non‐adiabatic coupling (NAC) of QDs to suppress non‐radiative recombination. As a result, the fabricated QDs‐based PEC devices deliver a maximum responsivity of 1.47 A W −1 and a specific detectivity of 6.47 × 10 11 Jones in PD mode, exhibiting broadband photoresponse up to 980 nm and enabling multi‐wavelength underwater optical imaging (UOI). In PS mode, the device further demonstrates biomimetic paired‐pulse facilitation (PPF), short‐term plasticity (STP) to long‐term plasticity (LTP) transition, and learning‐forgetting‐relearning behaviors. By unifying broadband underwater perception and neuromorphic memory within a single device, this work provides a promising bioinspired strategy for next‐generation underwater artificial visual systems and intelligent optoelectronic technologies.